Redirecting to a new URL from an old one

My website has a URl which would be removed soon and replaced by another new URL which i am already using. So in my old JSP i used onload= windows.location.href.... and gave my new URL..This worked perfectly. Now i am asked to give them ideas as to how to notify user about the change. I suggested using a temporary page and after a time delay redirect to the new URL. Is there any other approach to notify the user and how could that be better than the time delay approach.. Please help.